Reasons why you get tired:
‣Low serotonin: Can lead to low mood and decreased energy levels.
‣Poor sleep: Caused by other pms symptoms, or elevations in your temperatures which disrupt your sleep.
‣Low iron: Heavy bleeding during a period could lead to iron deficiency anemia.
‣Blood sugar instability: Eating certain foods can cause a dip if blood glucose level, making you feel tired.